Since the electromagnetic spectrum resource is becoming more and more scarce, improving
spectral efficiency is becoming extremely important for the sustainable development of …

We investigate the cooperative diversity gain in underlay cognitive radio (CR) systems
where secondary users access the spectrum licensed to primary users under an interference …

Cognitive radio (CR) is considered one of the prominent techniques for improving the
utilization of the radio spectrum. A CR network (ie, secondary network) opportunistically …

In this paper, we propose opportunistic jammer selection in a wireless security system for
increasing the secure degrees of freedom (DoF) between a transmitter and a legitimate …

Capacity of the cognitive radio network degrades due to the interference constraint from the
primary network. The secondary network capacity can be enhanced in a cost effective way …

In this paper, we consider user scheduling and power allocation techniques for downlinks
where transmitted message must be kept confidential from all other unintended users and …

This paper proposes Consensus-Before-Talk (CBT), a spectrum etiquette architecture
leveraged by distributed ledger technology (DLT). In CBT, secondary users' spectrum …

Cognitive radio (CR) systems are typically classified into two types. In overlay CR, a
secondary user opportunistically accesses primary user's spectrum when it is unused, while …

In this paper, we propose a novel relay selection scheme for orthogonal frequency-division
multiplexing systems by combining conventional bulk and per-subcarrier selection schemes …

This paper investigates the performance of an orthogonal frequency-division multiplexing
(OFDM)-based cognitive radio (CR) spectrum sharing communication system that assumes …